A trailing slash is trimmed

[LukasRychtecky]

Hi,

thank you for creating this useful library!

I ran out into a problem, but I'm not sure if it's a bug or a design decision. Here is an example:

(-> "http://myserver.com/path/ url (update :query {:param "value"}) str) ; http://myserver.com/path?param=value

A trailing slash is trimmed from (before ?). What I expect:

(-> "http://myserver.com/path/ url (update :query {:param "value"}) str) ; http://myserver.com/path/?param=value

What do you think?

[agriffis]

dup of #9